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tree-optimization/106521 - unroll-and-jam LC SSA rewrite 

The LC SSA rewrite performs SSA verification at start but the VN
run performed on the unrolled-and-jammed body can leave us with
invalid SSA form until CFG cleanup is run.  So make sure we do that
before rewriting into LC SSA.

	PR tree-optimization/106521
	* gimple-loop-jam.cc (tree_loop_unroll_and_jam): Perform
	CFG cleanup manually before rewriting into LC SSA.

	* gcc.dg/torture/pr106521.c: New testcase.
This commit is contained in:
Richard Biener 2022-08-04 11:55:15 +02:00
parent d86d81a449
commit d8552eaddc
2 changed files with 26 additions and 1 deletions
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10
gcc/gimple-loop-jam.cc
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@ -39,6 +39,7 @@ along with GCC; see the file COPYING3. If not see
#include "tree-ssa-loop-ivopts.h"
#include "tree-vectorizer.h"
#include "tree-ssa-sccvn.h"
#include "tree-cfgcleanup.h"
/* Unroll and Jam transformation
@ -609,9 +610,16 @@ tree_loop_unroll_and_jam (void)
if (todo)
{
free_dominance_info (CDI_DOMINATORS);
/* We need to cleanup the CFG first since otherwise SSA form can
be not up-to-date from the VN run. */
if (todo & TODO_cleanup_cfg)
{
cleanup_tree_cfg ();
todo &= ~TODO_cleanup_cfg;
}
rewrite_into_loop_closed_ssa (NULL, 0);
scev_reset ();
free_dominance_info (CDI_DOMINATORS);
}
return todo;
}

17
gcc/testsuite/gcc.dg/torture/pr106521.c Normal file
View File

@ -0,0 +1,17 @@
/* { dg-do compile } */
/* { dg-additional-options "-floop-unroll-and-jam --param unroll-jam-min-percent=0" } */
short a, b, e;
volatile long c;
long d;
int main() {
for (; d; d++) {
long g = a = 1;
for (; a; a++) {
g++;
c;
}
g && (b = e);
}
return 0;
}